Salmon & Steelhead Recovery Tracker

Sandy (Independent Population)

Oncorhynchus mykiss

Abundance

Annual estimates of the abundance of naturally-produced spawners for each population.

Spawning Year Nat. Origin Spawners 95% Confidence Interval Abundance Goal
2017 2,125
2016 5,488 856
2015 4,670 1,930 1,327
2014 3,249 1,117 1,551
2013 3,509 1,192 1,152
2012 357 1,107
2011 527 978
2010 1,498 949
2009
2008
2007 782
2006 569
2005 563
2004 796
2003 584
2002 1,031
2001 902
2000 741
1999 816
1998 776
1997 1,253
1996 1,131
1995 1,477
1994 1,377
1993 1,438
1992 2,563
1991 1,754
1990 628
1989 623
1988 709
1987 827
1986 625
1985 588
1984 714
1983 541
1982 611
1981 1,280
1980 624
1979 484
1978 928
1977 443
1976 639
1975 770
1974 601

Analysis

A population with a non-negative growth rate and an average abundance approximately equivalent to estimated historical average abundance should be considered to be in the highest persistence category. The estimate of historical abundance should be credible, the estimate of current abundance should be averaged over several generations, and the growth rate should be estimated with an adequate level of statistical confidence.

Evaluation Thresholds

Delisting

Pass - The observed spawner abundance is greater than or equal to the abundance modeled for delisting at least six times in any 12-year period and the average observed spawner abundance is greater than or equal to the average modeled abundance for delisting over that same time period.

Fail - The observed spawner abundance is greater than or equal to the abundance modeled for delisting less than six times in any 12-year period or the average observed spawner abundance is less than the average modeled abundance for delisting over that same time period.

Broadsense

Pass - The observed spawner abundance is greater than or equal to the abundance modeled for delisting at least six times in any 12-year period and the average observed spawner abundance is greater than or equal to the average modeled abundance for broad sense recovery over that same time period.

Fail - The observed spawner abundance is greater than or equal to the abundance modeled for delisting less than six times in any 12-year period or the average observed spawner abundance is less than the average modeled abundance for broad sense recovery over that same time period.

Average Abundance

Twelve years of data are necessary to evaluate this metric. Data will become available after a suitable number of years of monitoring have occurred.

Spawning Year Abundance Goal Average Abundance Avg. of Ab.Goal
2017
2016 856
2015 1,327
2014 1,551
2013 1,152
2012 1,107
2011 978
2010 949

Evaluation Thresholds

Twelve years of data are necessary to evaluate this metric. Data will become available after a suitable number of years of monitoring have occurred

Delisting

Pass - The observed spawner abundance is greater than or equal to the abundance modeled for delisting at least six times in any 12-year period and the average observed spawner abundance is greater than or equal to the average modeled abundance for delisting over that same time period.

Fail - The observed spawner abundance is greater than or equal to the abundance modeled for delisting less than six times in any 12-year period or the average observed spawner abundance is less than the average modeled abundance for delisting over that same time period.

Broadsense

Pass - The observed spawner abundance is greater than or equal to the abundance modeled for delisting at least six times in any 12-year period and the average observed spawner abundance is greater than or equal to the average modeled abundance for broad sense recovery over that same time period.

Fail - The observed spawner abundance is greater than or equal to the abundance modeled for delisting less than six times in any 12-year period or the average observed spawner abundance is less than the average modeled abundance for broad sense recovery over that same time period.

Hatchery Proportion

The proportion of spawning fish that are of hatchery origin in each lower Columbia River population.

Spawning Year Proportion Hatchery
2017 0.01
2016 0.06
2015 0.10
2014 0.03
2013 0.06
2012 0.00
2011 0.00
2010 0.28
2009
2008
2007 0.00
2006 0.00
2005 0.00
2004 0.00
2003 0.00
2002 0.00
2001 0.00
2000 0.00
1999 0.00
1998 0.12
1997 0.12
1996 0.12
1995 0.12
1994 0.12
1993 0.12
1992 0.12
1991 0.12
1990 0.80
1989 0.79
1988 0.79
1987 0.78
1986 0.77
1985 0.79
1984 0.68
1983 0.78
1982 0.77
1981 0.69
1980 0.79
1979 0.76
1978 0.77
1977 0.74
1976 0.76
1975 0.74
1974 0.74

Average Hatchery Proportion

Nine years of data are necessary to evaluate this metric. Data will become available once a suitable number of years of monitoring have occurred

Spawning Year 9-yr. pHOS Avg. pHOS Limit
2017 0.07 0.10
2016 0.08 0.10
2015 0.07 0.10
2014 0.05 0.10
2013 0.05 0.10
2012 0.04 0.10
2011 0.04 0.10
2010 0.04 0.10

Evaluation Thresholds

Nine years of data are necessary to evaluate this metric. Data will become available once a suitable number of years of monitoring have occurred

Delisting

Pass – Over a nine-year period, the average percentage of the total number of natural spawners that are of hatchery origin is on average less than or equal to the population specific hatchery stray rate target.

Fail – Over a nine-year period, the average percentage of the total number of natural spawners that are of hatchery origin is on average greater than the population specific hatchery stray rate target.

Broadsense

Pass – Over a nine-year period, the average percentage of the total number of natural spawners that are of hatchery origin is on average less than or equal to 10 percent.

Fail – Over a nine-year period, the average percentage of the total number of natural spawners that are of hatchery origin is on average greater than 10 percent.